Benchmark's ValuSmart Tape 80

Do you have mission-critical machines
that need to be backed up and need a reasonably priced solution?
The VS Tape 80 DLT backup drive may be the answer. As part of a new
generation of half-height DLT drives, this device is geared toward
users who require tape drives that will fit into an existing
rackmount system. In other words, if you have little rackmount
space to spare, this drive may very well suit your needs.

Benchmark
(www.4benchmark.com)
was kind enough to provide me with an external VS Tape 80 with an
Adaptec 29160 card. The test machine consisted of a dual PIII with
800MHz processors, 7200RPM IDE disks and 512MB RAM. We used Red Hat
7.2 and BRU-Pro 2.0 as our backup solution.

Prior to receiving the drive, I was unsure whether corners
had been cut in order to achieve a half-height form. This was,
after all, the world's first half-height DLT. Fortunately, that
doesn't appear to be the case. The drive itself feels like a
quality product and also performs like one. It comes with three
simple LEDs on the front: Drive Error, Ready and Clean Media. It
also has an unload button that has a nice soft feel and, unlike
many DLT drives, doesn't require you to flip a locking mechanism to
eject or insert. My only concern was the sound the drive made when
inserting or ejecting media. It was a loud, grainy sound that
didn't sound like any other drives I'd heard before. That said, it
was probably nothing serious, as BRU-Pro 2.0 performs checksums on
the buffer level, and I never once found an error. If any of you
are prone to taking naps during backups (as I am), it should be
mentioned that the drive is incredibly quiet during operation, and
the slight humming sound greatly facilitates sleep.

From a performance standpoint, this puppy won't scream like
an LTO drive (which can reach 15-30MB/s for the HP Ultrium 230
models—see the review in the December 2001 issue of
LJ, on-line at
www.linuxjournal.com/article/5412).
However, it also costs less than a third of what the HP Ultrium LTO
drives cost. According to Benchmark, the drive performs at 3MB/s
native and 6MB/s compressed. BRU-Pro allows you to tweak the size
of the block size it writes. I was unable to get any significant
changes in speed by tweaking this value, though the 64K buffer
seemed to offer the best performance. In the end, I was able to
achieve writing speeds between 3.3 and 4.5MB/s, with an average
speed of around 4MB/s. Restores were typically a little slower,
averaging about 3.8MB/s. I called TOLIS Group, makers of BRU-Pro,
because I knew they used these drives for some of their internal
testing and training. They told me they've managed to push the
drive to 5MB/s in their tests. I was unable to reach this speed but
came close.

For the individual looking to back up more than 80GB,
Benchmark has a product called the 640 Blade, which uses the same
drive with eight tape cartridges that rotate in a carousel into the
drive for a total capacity of 640GB (compressed). It's the first 2U
DLT autoloader designed to fit in rack-optimized servers. At $4,000
US, the entire system costs less than a single HP Ultrium 230
upgrade kit for their SureStore line. For those looking for both
speed and space, Benchmark makes the argument that at such low
cost, several of their 640 Blades still cost less than a typical
autoloader and offer more reliable backups.

The primary backup system we use here is an HP SureStore 2/20
with two HP Ultrium 230 drives. The HP SureStore 2/20 costs about
$21,000 US and can push up to 15MB/s native (or 1.08TB/hour) on
each drive. For about the same cost one could purchase five 640
Blades. From a purely mathematical view, it would appear that the
Blades would be slower. Each Blade can push about 10.8GB/hour
(native). With five you would top out at around 54GB/hour.

However, I think the Blades, depending on your configuration,
might be a faster solution. How? The catch is that the Ultrium 230s
are so fast that we've had trouble pushing data to them as fast as
they can write. In our environment we have a handful of fast
machines that can push data at about 8-11MB/s to the Ultriums and
about 20 clients on a slower network that can only push data at
about 3-4MB/s. At any given point in time we can back up two
clients, one to each drive (we do not use multiplexing because of
the serious performance hit it causes on restores). The bottleneck
in our case isn't our network but rather the slower, older client
machines. If instead of the Ultrium drives we had five 640 Blades,
we could write five clients at any given point in time, making our
effective backup rate faster than the Ultriums'.

It also should be noted that with the 640 Blades you would
have multiple drives and multiple backup solutions, so if one did
unexpectedly get destroyed in a freak accident (such as spilling
coffee on it during one of your naps), you wouldn't be left high
and dry. Certainly from that perspective, the 640 Blade offers
peace of mind and added reliability. I would recommend the Blade
640s for small to medium-sized environments, clustered environments
or physically disperse environments in which having several backup
servers makes sense. They are certainly worth considering when cost
is a major deciding factor. Benchmark will also be coming out with
a VS Tape 160 drive with double the capacity and an impressive
8MB/s native speed by the time you read this.

If you need a top-of-the-line system with all the speed and
power you can muster, provided you can push data fast enough, LTO
is probably the way to go, and our system from HP has performed
well (knock on wood). If what you need is something small,
well-priced and reasonably powerful, the VS Tape 80 is an excellent
choice. I've grown quite enamored with the drive since I plugged it
in (and also with BRU-Pro 2.0—see my review at
www.linuxjournal.com/article/6068),
and I wish I could afford one for my own personal use. Donations
are welcome.

Cosimo Leipold
is an analyst for DiamondCluster International in Chicago. He
spends his free time skiing, scuba diving and trying to take as
much vacation as possible. He welcomes comments, thoughts and ideas
at
cosimo@hypnotic.net.

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